Sikalastic®-844 XT
Sikalastic®-844 XT is a two part, elastic, 100 % solids, very fast curing and coloured pure polyurea, liquid applied membrane with excellent chemical resistance. Suitable for use in hot and tropical climatic conditions.
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Applicable in temperatures from -20°C to +50°C
- Performs in constant dry temperatures from-30°C to +100°C
- Good crack bridging properties
- Excellent chemical resistance
- Excellent abrasion resistance
- UV light exposure may lead to yellowing and chalking
- Resistant to biogenic sulphuric acid
Usage
Sikalastic®-844 XT is used as:- Abrasion resistant protective coating in industrial and manufacturing facilities
- Tank, bund and pit lining in sewage and waste water treatment plants
- Suitable for the use in areas with presence of biogenic sulphuric acid
Advantages
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Applicable in temperatures from -20°C to +50°C
- Performs in constant dry temperatures from-30°C to +100°C
- Good crack bridging properties
- Excellent chemical resistance
- Excellent abrasion resistance
- UV light exposure may lead to yellowing and chalking
- Resistant to biogenic sulphuric acid
Packaging
Part A (Isocyanate) | 209.8 kg drums ~189 L |
Part B (Amine) | 181.4 kg drums ~189 L |
Colour
Part A | Clear |
Part B | Grey |
Grey, approximately RAL 7005
Product Details
SUSTAINABILITY
- Conformity with LEED v4 MRc 2 (Option 1): Building Product Disclosure and Optimization – Environmental Product Declarations
- Conformity with LEED v2009 IEQc 4.2: Low-Emitting Materials - Paints and Coatings
APPROVALS / CERTIFICATES
- Coating for concrete protection according the requirements of EN 1504-2/2004, DoP 02 07 02 05 001 0000017, certified by FPC Notified Body and provided with CE-Marking
- Kiwa Polymer Institute GmbH, report no. P7074-1, 2011, testing od static and dynamic crack bridging ability in accordance with DIN EN 1062-7, as well as bond strength after freeze-thaw-cycling with de-icing salt immersion and after thundershower cycling according DIN EN 13687-1 and -2, in combination with Sikafloor®-161
- KB-Hoch, report no. 100591, 2010, Reaction to fire classification according DIN EN ISO 13501-1
Composition
Pure polyurea
Shelf life
Part A: 12 month
Part B: 12 month
Storage conditions
The packaging must be stored properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C. Protected from direct sunlight.
Density
Part A | ~1.11 kg/l |
Part B | ~0.96 kg/l |
Density values determined at +23 °C
Solid content
~99 %
Viscosity
Temperature | Part A | Part B |
+20 °C | ~1700 mPas | ~1700 mPas |
Shore D Hardness
45–50 | (DIN 53505) |
Mechanical Resistance
~100 mg | H 22 / 1000 g / 1000 cy |
~108 mg | H 17 / 1000 g / 1000 cy |
Tensile Strength
> 10 N/mm² | (DIN 53504) |
Crack Bridging Ability
Class A4 | Static |
Class B3.1 | Dynamic |
Chemical Resistance
Sikalastic®-844 XT is resistant to various chemicals. Contact Sika Technical Service for specific information.
Application
Mixing Ratio
Part A : Part B = 1 : 1 (volume)
Layer Thickness
> 2 mm
Product Temperature
> +65 °C
Ambient Air Temperature
+1 °C min. / +40 °C max.
Relative Air Humidity
< 85 %
Dew Point
The substrate and the uncured membrane must be at least +3 °C above dew point to reduce the risk of condensation. Beware of condensation.
Substrate Temperature
+1 °C min. / +50 °C max.
Substrate Moisture Content
≤ 4 % pbw moisture content.
Test method: Sika®-Tramex meter, CM - measurement on Oven-dry method
No rising moisture according to ASTM (Polyethylene-sheet)
Curing Time
24 h / +20 °C
Gel time
~10 s / +20 °C
Waiting Time / Overcoating
Temperature | minimum | maximim |
+10 °C | ~1 minute | 7 hours |
+20 °C | ~1 minute | 6 hours |
+30 °C | ~1 minute | 6 hours |
Consumption
~1.08 kg/m²/ mm
SUBSTRATE PREPARATION
The surface must be sound, of sufficient strength, clean, dry and free of dirt, oil, grease and other contamination.
Depending on the material the substrate must be primed or mechanically cleaned.
Grinding may be necessary to level the surface. Suitable substrates
are such as: Concrete and metal.
Substrate Pre-Treatment
Substrate | Primer | Consumption [mL/m2] |
Cementitious substrates | Sikafloor®-161 lightly broadcast with quartz sand, 0.3 - 0.8. Example SikaDur®-507 | ~200 – 300 |
MIXING
Dose and mix with a suitable air driven or electrical plural component heated spray equipment. Both components must be heated up to the temperatures given in the related Product Data Sheet. The accuracy of mixing and dosage must be controlled regularly with the equipment. Thoroughly stir part B (Amine) using a drum stirrer until a homogenous colour is obtained.
APPLICATION
Sikalastic®-844 XT is spray applied in a continuous spray application to achieve a homogeneous film.
CLEANING OF EQUIPMENT
Clean all tools with Thinner C immediately after use. The application equipment has to cleaned and filled with Mesamoll. Hardened and/or cured material can only be removed mechanically.